Is she waiting for me to say something?

Me and this girl began to hit it off real well. I was kind of in that "zone" with her, if you know what I mean, we fed off each other real well, had the same sense of humor and everything. Unfortunately, this went on for only a couple weeks, and then we had a week off from school.

After that week off, she's been aloof. She hasn't talked to me at all. We were in the same room a few times, and mostly she's ignored me and hasn't looked at me and talked to other people. One time she sorta half-smiled at me because I smiled at her, but she didn't really give eye contact. She's ignored me completely and hasn't said a word, even though she herself seems to be doing fine because she's talking to other people and is in good spirits.

So I'm confused. We were really getting along and I didn't do/say anything wrong. About halfway through that week off, I texted her something funny and she replied with something funny. That was the first time I contacted her out of school, but that's it.
Is she waiting for me to say something?
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